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    • 6. 发明申请
    • METHOD FOR SYNTHESIZING 2,7-DIMETHYL-2,4,6-OCTATRIENE-1,8-DIALDEHYDE
    • 合成2,7-二甲基-2,4,6-四甲基-1,1-二氢二氢呋喃的方法
    • US20140378711A1
    • 2014-12-25
    • US14369164
    • 2012-12-10
    • NANJING UNIVERSITY OF TECHNOLOGYZhejiang Medicine Co., Ltd. Xinchang Pharmaceutical Factory
    • Chunlei LVShiqing PiJianhui ChenDingqiang LuPingkai Ouyang
    • C07C45/42C07C1/32C07C41/22C07F9/38C07C41/06C07C41/18
    • C07C45/42C07C1/324C07C41/06C07C41/18C07C41/22C07C45/52C07F9/38C07C47/21
    • Provided in the present invention is a method for synthesizing 2,7-dimethyl-2,4,6-octatriene-1,8-dialdehyde. The synthesis method comprises the following steps: (1) adding acetaldehyde diethyl acetal and ethyl-(1-propenyl)-ether under the effect of a catalyst to produce 1,1,3-triethoxy-2-methyl-butane; (2) pyrolysis synthesizing 1,1,3-triethoxy-2-methyl-butane under the catalytic effects of isoquinoline and p-Toluenesulfonic acid to produce 1-methoxy-2-methyl-1,3-butadiene; (3) dissolving 1-methoxy-2-methyl-1,3-butadiene in anhydrous ethanol solvent for synthesis with a phase transfer catalyst, cetyl-trimethyl ammonium bromide, and a chlorinating agent, trichloroisocyanuric acid, to generate 4,4-diethoxy-3-methyl-1-chloro-butene; (4) combining 4,4-diethoxy-3-methyl-1-chloro-butene with a triphenylphosphine salt to produce a phosphonium salt; and (5) condensing the phosphonium salt under the effects of hydrogen peroxide in conjunction with sodium carbonate solution to generate 1,1,8,8-tetramethyl-2,7-dimethyl-2,4,6-octatriene; then hydrolyzing under acidic conditions to synthesize 2,7-dimethyl-2,4,6-octatriene-1,8-dialdehyde. The present invention has a simple process route, is easy to operate, and has mild conditions, great yield, and great industrial value.
    • 本发明提供了合成2,7-二甲基-2,4,6-辛二烯-1,8-二醛的方法。 合成方法包括以下步骤:(1)在催化剂作用下加入乙醛缩二乙醇和乙基 - (1-丙烯基) - 醚,制得1,1,3-三乙氧基-2-甲基 - 丁烷; (2)在异喹啉和对甲苯磺酸的催化作用下热解合成1,1,3-三乙氧基-2-甲基丁烷,得到1-甲氧基-2-甲基-1,3-丁二烯; (3)将1-甲氧基-2-甲基-1,3-丁二烯溶于无水乙醇溶剂中,用相转移催化剂,十六烷基三甲基溴化铵和氯化剂三氯异氰脲酸合成,得到4,4-二乙氧基 -3-甲基-1-氯 - 丁烯; (4)将4,4-二乙氧基-3-甲基-1-氯 - 丁烯与三苯基膦盐结合以产生鏻盐; 和(5)在过氧化氢与碳酸钠溶液的作用下使鏻盐缩合,生成1,1,8,8-四甲基-2,7-二甲基-2,4,6-辛二烯; 然后在酸性条件下水解合成2,7-二甲基-2,4,6-辛二烯-1,8-二醛。 本发明工艺路线简单,操作方便,条件温和,产量大,工业价值高。